OK. So I cant see either subs or CDC parking on the side where there are only two, but based on max length mentioned by the Admiral, there would be room for two nested together, perhaps three on the side with three MCDV's in the picture.
That could be more than sufficient depending on the actual draft of CDC. The German corvettes of the Braunschweig class draw only 11 feet 4 inches (that's two feet less than the old Gate Vessels and about the same as the MCDV's.